Page programming sequences and assignment schemes for a memory device
View Patent ↗Embodiments of the invention are directed towards a memory device comprising a plurality of wordlines each coupled to a row of memory cells in a subtile of the memory device, a plurality of level one column select circuits coupled to each cell in a plurality of groups of cells in a subtile, a plurality of level two column select circuits coupled to each of the plurality of groups of cells in the subtile, a common bit line coupled to the plurality of level one column select circuits and the plurality of level two column select circuits, the common bit line also coupled to a sense and program circuit, wherein the sense and program circuit addresses each first cell in each of the groups of cells to form a single page of memory.
1. A memory device comprising:
a plurality of memory tiles, each of which includes a plurality of memory cells;
a plurality of word lines each configured to be coupled to a row of the memory cells;
a plurality of column select circuits configured to be coupled to each of the memory cells; and
a common bit line configured to be coupled to the plurality of column select circuits, the common bit line also coupled to a sense and program circuit;
wherein a plurality of subtiles are located in each of the memory tiles.
2. The memory device of claim 1 , wherein a plurality of groups of the memory cells is located in each of the subtiles.
3. The memory device of claim 2 , wherein the sense and program circuit addresses each of the memory cells in each of the groups of the memory cells, and a voltage of a common sense line sets a low voltage for a reset operation.
4. The memory device of claim 2 , wherein the sense and program circuit addresses each of the memory cells in each of the groups of the memory cells, and a voltage of a common source line is raised to a set voltage for a set operation.
5. The memory device of claim 1 , wherein the plurality of column select circuits include first and second column select circuits.
6. The memory device of claim 5 , wherein a first level of the second column select circuit is enabled for a first period, a second level of the second column select circuit is enabled for a second period, a third level of the second column select circuit is enabled for a third period, and a fourth level of the second column select circuit is enabled for a fourth period, wherein each level of the second column select is enabled by raising the common bit line to a reset voltage and lowering the common bit line to a ground voltage during each period.
7. The memory device of claim 1 , wherein the memory device is a resistive random access memory (RRAM) memory device.
8. The memory device of claim 4 , wherein the sense and program circuit moves sequentially to a next neighboring group of the memory cells in each of the subtiles.
9. The memory device of claim 8 , wherein the voltage of the common source line is a ground voltage for a reset operation.
10. The memory device of claim 1 , further comprising:
a common source line configured to be coupled to the memory cells.
11. The memory device of claim 10 , wherein a voltage of the common source line is raised to a set voltage for a set operation.